everything is black hat. any attempt to manipulate search rankings of your own site or any other site for that matter, is black hat, since SEs want everything to be natural. if you sit there writing 100 'helpful' comments a day, it's still black hat, it's just very, very stupid black hat. if you sit there registering for hundreds of forums every day by hand instead of using xrumer, it's still black hat, it's just very, very stupid black hat.

White hat is doing things in a way that meets Google guidelines. Which pretty much involves on-site optimization, creating new content and keeping your fingers crossed someone starts linking to you, although if you are writing articles and manually submitting them to quality article directories, I guess that can be seen as whitehat.

Black hat involves manipulating your rankings with a network of backlinks that you initiate -- and most other things which are against Google's webmaster guidelines (using any of the popular SEO backlink tools out there, or hiring others to build backlinks).

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